Closing down a company with only me (MD) owed money

After many years I have decided to close my current LTD company and move onto something completely different, as a sole trader.

My LTD company doesn't owe anyone money apart from me (MD). My tax year ended 31.08.17 and my accountant is due to complete the accounts before the 9 months soon (by May) BUT I wondered if I stopped trading now, will I still need to file my previous years accounts?

Does this give me enough time between the company laying 'dormant' to the returns due date?

Does 'dormant' also include any transactions through the bank, ie, depositing money from the few sales invoices that are due?